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EP2925621B1 - Verfahren zum abdichten eines kunststoffbeutels und nach diesem verfahren hergestellter kunststoffbeutel - Google Patents

Verfahren zum abdichten eines kunststoffbeutels und nach diesem verfahren hergestellter kunststoffbeutel Download PDF

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Publication number
EP2925621B1
EP2925621B1 EP13799463.8A EP13799463A EP2925621B1 EP 2925621 B1 EP2925621 B1 EP 2925621B1 EP 13799463 A EP13799463 A EP 13799463A EP 2925621 B1 EP2925621 B1 EP 2925621B1
Authority
EP
European Patent Office
Prior art keywords
wall
layer
adhesive
bag
front wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13799463.8A
Other languages
English (en)
French (fr)
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EP2925621A1 (de
Inventor
Jacobo Bazbaz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polytex Fibers LLC
Original Assignee
Polytex Fibers LLC
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Filing date
Publication date
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Publication of EP2925621A1 publication Critical patent/EP2925621A1/de
Application granted granted Critical
Publication of EP2925621B1 publication Critical patent/EP2925621B1/de
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7292—Textile or other fibrous material made from plastics coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B32B37/1292—Application of adhesive selectively, e.g. in stripes, in patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/16—End- or aperture-closing arrangements or devices
    • B65D33/18—End- or aperture-closing arrangements or devices using adhesive applied to integral parts, e.g. to flaps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/702—Amorphous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/46—Bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present disclosure relates to improved methods for sealing plastic bags, and in particular plastic bags with pinch ends.
  • Laminated woven sacks were developed using a woven polypropylene structure laminated to a bi-oriented polypropylene film (BOPP) that can be reverse printed with high end graphics suitable for consumer type of packaging.
  • the LWS provides a stronger, more attractive bag than the more conventional multiwall bags used for that purpose over the last 20 years. Due to their tough strong structure, conventional LWS bags are typically sewn shut on both ends. These LWS recently met with success and have been successfully substituted for the conventional multiwall paper bags used in the pet food industry for many years.
  • sewn LWS One major drawback of the sewn LWS has been the closing of the bags at high speed filling lines, such as those for filling such bags with pet food. Experience has shown that sewing production lines are typically slower than the filling of the multiwall pinch bottom bags. Additionally, the sewn bags do not provide an aesthetically pleasing and useful clean display on the ends of the bags, thus making it difficult for consumers to identify or find a desired brand quickly when the bags are displayed on the shelves at the point of sale, such as when they are stacked on top of one another. In addition, the sewn ends required puncturing the plastic bags and thus result in a bag that is not sealed, leading to somewhat reduced shelf-life and possible infestation of the contents of the bag.
  • Woven plastic bags have been used and are conventional for certain applications.
  • An example of a conventional woven plastic bag is provided in U.S. Patent No. 4,373,979 ("the '979 patent"), issued on February 15, 1983.
  • the '979 patent describes the use of woven strips of highly longitudinally-oriented, high-density polyethylene or polypropylene in a bag construction in which the bag is formed from a seamed tube made of the woven plastic material.
  • the seamed tube has gussets on either side and, when a portion is cut from the rest of the tube, a bag having two open, unsealed ends is provided.
  • the '979 patent describes the use of ultrasonic spot welds to seal portions of a bag made of such woven plastic strips, as opposed to sewing the seams of a bag or using a hot melt adhesive to seal the gusset forming pleat.
  • the '979 patent purports to be an improvement for sealing a plastic bag.
  • sewing one end tends to take longer, thus adding time to the manufacturing process.
  • the sewn ends in a conventional bag tend to be a weak portion of the bag, and a likely location for rips, tearing, and subsequent loss of contents during storing, shipping and handling.
  • such bags may not provide sufficient protection from infestation from vermin and/or insects.
  • US2010/154362 discloses a method and apparatus for sealing a polymeric bag but it does not teach an adhesive-to-plastic seal.
  • the method comprises applying a heat activated first adhesive layer on a first panel of the bag; applying a heat activated second adhesive layer on a second panel of the bag including a flap portion, wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric material; pinch closing an open end of the bag; creasing the bag along a fold line; applying heat to the first adhesive layer and the second adhesive layer at a temperature below the softening point temperature of the polymeric material to activate the first adhesive layer and the second adhesive layer to adhesive states; and folding the bag along the fold line to form an adhesive-to adhesive seal by contact between the first adhesive layer and the second adhesive layer.
  • the present disclosure provides a method of sealing a plastic bag in accordance with claim 1.
  • the method makes the presently disclosed woven plastic bags faster and less expensive to produce than conventional woven plastic bags.
  • the first layer comprises polypropylene, high density polyethylene, low density polyethylene, polyester, or any combination thereof. In other embodiments at least a portion of the second layer comprises a printed area thereon. In further embodiments the second layer comprises polypropylene, polyethylene, polyethylene terephthalate, polyamide, or any combination thereof. In yet further embodiments the second layer comprises oriented polypropylene, biaxially-oriented polypropylene, oriented polyethylene, biaxially-oriented polyethylene, oriented polyethylene terephthalate, biaxially-oriented polyethylene terephthalate, oriented polyamide, biaxially-oriented polyamide, or any combination thereof. The first layer and second layer are laminated together.
  • the adhesive is an amorphous polyalphaolefin.
  • the first end and the second end of the bag are sealed, and wherein the bag comprises at least ten pounds by weight of a filling material.
  • the bag further comprises a third layer comprising a polymer between the first layer and the second layer.
  • the third layer comprises a woven polymer, including, but not limited to, polypropylene, high density polyethylene, low density polyethylene, polyester, or any combination thereof.
  • the third layer comprises a polymeric film including, but not limited to, polypropylene, polyethylene, polyethylene terephthalate, polyamide, or any combination thereof.
  • the present disclosure also provides plastic bags in accordance with claim 8.
  • the first layer comprises polypropylene, high density polyethylene, low density polyethylene, polyester, or any combination thereof.
  • at least portions of the exterior surfaces of each of the front wall and the back wall comprise a plurality of discrete areas further comprising printing thereon.
  • a portion of the front wall and a portion of the back wall combine to form a discrete portion of the bag located at or near either the top end or the bottom end, wherein the discrete portion of the bag comprises printing thereon.
  • FIG. 1 the front side view of the top portion of a "pinch cut” bag 1 is shown with the prior art adhesive application pattern.
  • the bag 1 has a first or top end 100 and a second or bottom end that is not visible in FIG. 1 . It will be apparent, however, that the orientation of the bag ends is unimportant and the "top” and “bottom” references are useful but may change depending on the orientation one views the bag.
  • the bag 1 has a front wall 101 with top end 102, a rear wall 103 with top end 104, and two side walls 105 and 106.
  • Bag 1 is considered a "pinch cut” bag because the front wall 101 and the back wall 103 are cut so that one of the ends of the front wall 101 or the back wall 103 is longer than the other; they have different lengths.
  • the top end 104 of the back wall 103 at the top end 100 of the bag 100 is cut longer than the top end 102 of the front wall 101.
  • Either one or both of the ends of the bag 1 can have a "pinch cut.”
  • conventional techniques can be used to provide side gussets in the bag 1 for each of sides 105 and 106 during this forming process.
  • the first end 100 of bag 1 has portions 107a and 107b of the rear wall 103 of the bag that extend further from the body of the bag 1 than do portions 108a and 108b of the material of bag 100a forming the side gussets for sides 102 and 103.
  • the portions 108a and 108b of the side gussets extend further from the body of the bag 1 than the top end 102 of the front wall 101 of the bag 1.
  • the prior art adhesive application pattern is represented by the double headed arrow marked "A,” and extends from the top end 104 of the rear wall 103 to the adhesive stop line 109.
  • the top end 100 of the bag 1 is folded at fold line 110 such that the top end 104 of the rear wall 103 meets the adhesive stop line 109. This leads to an adhesive-to-adhesive seal at the top end 100 of the bag 1.
  • FIG. 2 the front side view of the top portion of a "pinch cut” bag 1 is shown with the presently described adhesive application pattern.
  • the bag 1 has a first or top end 100 and a second or bottom end that is not visible in FIG. 2 . It will be once again be apparent, however, that the orientation of the bag ends is unimportant and the "top” and “bottom” references are useful but may change depending on the orientation one views the bag.
  • the bag 1 has a front wall 101 with top end 102, a rear wall 103 with top end 104, and two side walls 105 and 106.
  • Bag 1 is considered a "pinch cut" bag because the front wall 101 and the back wall 103 are cut so that one of the ends of the front wall 101 or the back wall 103 is longer than the other; they have different lengths.
  • the top end 104 of the back wall 103 at the top end 100 of the bag 100 is cut longer than the top end 102 of the front wall 101.
  • Either one or both of the ends of the bag 1 can have a "pinch cut.”
  • conventional techniques can be used to provide side gussets in the bag 1 for each of sides 105 and 106 during this forming process.
  • the first end 100 of bag 1 has portions 107a and 107b of the rear wall 103 of the bag that extend further from the body of the bag 1 than do portions 108a and 108b of the material of bag 100a forming the side gussets for sides 102 and 103.
  • the portions 108a and 108b of the side gussets extend further from the body of the bag 1 than the top end 102 of the front wall 101 of the bag 1.
  • the presently described adhesive application pattern is represented by the double headed arrow marked "B," and extends from the top end 104 of the rear wall 103 to the adhesive stop line 109.
  • the amount of adhesive used in the present adhesive application pattern is greatly reduced compared to the prior art pattern ( FIG.
  • the top end 100 of the bag 1 is folded at the adhesive stop line 109 such that the top end 104 of the rear wall 103 meets the adhesive stop line 109.
  • the bag sealed using the presently described process is able to hold a greater volume of product when compared to bags sealed using the prior art process ( FIG. 1 ).
  • the bag according to the invention may vary in size, dimensions, and shape without departing from the scope of the invention, and that the foregoing description of the preferred embodiments is not intended to limit the scope of the invention as defined by the claims.
  • the bag 1 may be provided with a re-usable opening (not shown) or a corner portion adapted to allow a person to easily pour the contents of the bag 1 out (not shown), or a combination of these two features. Such features are conventional with prior art bags.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)

Claims (11)

  1. Verfahren zum Abdichten eines Kunststoffbeutels (1) mit einer Vorderwand (101), einer Rückwand (103), einer ersten Seitenwand (105), einer zweiten Seitenwand (106), einem ersten Ende, einem zweiten Ende, einer ersten Schicht, einer zweiten Schicht und einer dritten Schicht, wobei die Vorderwand (101), die Rückwand (103), die erste Seitenwand (105) und die zweite Seitenwand (106) eine Innenfläche, eine Außenfläche, ein erstes Ende und ein zweites Ende aufweisen,
    wobei die erste Schicht ein gewebtes Polymer, die zweite Schicht eine Folie und die dritte Schicht ein Polymer umfasst und wobei die erste Schicht und die zweite Schicht zusammenlaminiert sind und die dritte Schicht sich zwischen der ersten und der zweiten Schicht befindet,
    wobei das erste Ende (104, 107a, 107b) der Rückwand (103) weiter vorspringt als das erste Ende der ersten Seitenwand (105) und das erste Ende der zweiten Seitenwand (106),
    wobei eine Seitenfalte in der ersten Seitenwand (105) vorgesehen ist, um einen ersten Rückbereich (108a) und einen ersten Vorderbereich bereitzustellen, wobei das erste Ende des ersten Rückbereichs (108a) weiter vorspringt als das erste Ende des ersten Vorderbereichs,
    wobei eine Seitenfalte in der zweiten Seitenwand (106) vorgesehen ist, um einen zweiten Rückbereich (108b) und einen zweiten Vorderbereich bereitzustellen, wobei das erste Ende des zweiten Rückbereichs (108b) weiter vorspringt als das erste Ende des zweiten Vorderbereichs und
    wobei das erste Ende des ersten Vorderbereichs und das erste Ende des zweiten Vorderbereichs weiter vorspringen als das erste Ende (102) der Vorderwand (101),
    wobei das Verfahren umfasst:
    a) das Auftragen eines amorphen Alpha-Olefin-Klebstoffs auf die Innenfläche des ersten Endes (104, 107a, 107b) der Rückwand (103), das weiter vorspringt als das erste Ende (102) der Vorderwand (101);
    b) das Auftragen des Klebstoffs auf die Außenfläche des ersten Endes des ersten und des zweiten Rückbereichs (108a, 108b), das jeweils weiter vorspringt als das erste Ende des ersten und des zweiten Vorderbereichs;
    c) das Auftragen des Klebstoffs auf die Innenfläche des ersten Endes des ersten und des zweiten Vorderbereichs, das jeweils weiter vorspringt als das erste Ende (102) der Vorderwand (101);
    d) das Auftragen des Klebstoffs auf die Außenfläche der Vorderwand (101), die sich zwischen einer Klebstoffstopplinie (109) und dem ersten Ende (102) der Vorderwand (101) befindet, wobei die Klebstoffstopplinie (109) eine Faltlinie an der Außenfläche der Vorderwand (101) definiert und die Klebstoffstopplinie (109) proximal zu dem ersten Ende (102) der Vorderwand (101) liegt und wobei die Faltlinie etwa 0,64 cm (1/4 inch) unterhalb des ersten Endes der Vorderwand liegt;
    c) das Falten des ersten Endes (104, 107a, 107b) des Kunststoffbeutels (1) an der Faltlinie derart, dass die Innenfläche des ersten Endes (104, 107a, 107b) der Rückwand (103) zumindest einen Abschnitt der Außenfläche der Vorderwand (101) kontaktiert und eine Klebstoff-zu-Kunststoff-Abdichtung bildet, und
    wobei beim Verriegeln des Kunststoffbeutels (1) kein Klebstoff-zu-Klebstoff-Kontakt gebildet wird.
  2. Verfahren nach Anspruch 1, wobei die erste Schicht Polypropylen, Polyethylen mit hoher Dichte, Polyethylen mit niedriger Dichte, Polyester oder Kombinationen davon umfasst und/oder wobei die zweite Schicht Polypropylen, Polyethylen, Polyethylenterephthalat, Polyamid oder Kombinationen davon umfasst, z.B. wobei die zweite Schicht orientiertes Polypropylen, biaxial orientiertes Polypropylen, orientiertes Polyethylen, biaxial orientiertes Polyethylen, orientiertes Polyethylenterephthalat, biaxial orientiertes Polyethylenterephthalat, orientiertes Polyamid, biaxial orientiertes Polyamid oder Kombinationen davon umfasst.
  3. Verfahren nach Anspruch 1, wobei wenigstens ein Teil der zweiten Schicht einen bedruckten Bereich aufweist.
  4. Verfahren nach Anspruch 1, wobei das erste Ende und das zweite Ende des Beutels verriegelt sind und wobei der Beutel bezogen auf das Gewicht mindestens 4,54 kg (zehn pounds) Füllmaterial umfasst.
  5. Verfahren nach Anspruch 1, wobei die dritte Schicht ein gewebtes Polymer umfasst.
  6. Verfahren nach Anspruch 5, wobei die dritte Schicht Polypropylen, Polyethylen mit hoher Dichte, Polyethylen mit niedriger Dichte, Polyester oder Kombinationen davon umfasst.
  7. Verfahren nach Anspruch 1, wobei die dritte Schicht einen Polymerfilm umfasst, z.B. wobei die dritte Schicht Polypropylen, Polyethylen, Polyethylenterephthalat, Polyamid oder Kombinationen davon umfasst.
  8. Kunststoffbeutel (1) mit einer Vorderwand (101), einer Rückwand (103), einer ersten Seitenwand (105), einer zweiten Seitenwand (106), einer Innenfläche, einer Außenfläche, einem ersten Ende, einem zweiten Ende, einer ersten Schicht, einer zweiten Schicht und einer dritten Schicht, wobei die Vorderwand (101), die Rückwand (103), die erste Seitenwand (105) und die zweite Seitenwand (106) eine Innenfläche, eine Außenfläche, ein erstes Ende und ein zweites Ende aufweisen, wobei die erste Schicht ein gewebtes Polymer, die zweite Schicht eine Folie und die dritte Schicht ein Polymer umfasst und wobei die erste Schicht und die zweite Schicht zusammenlaminiert sind und die dritte Schicht sich zwischen der ersten und der zweiten Schicht befindet,
    wobei das erste Ende (104, 107a, 107b) der Rückwand (103) weiter vorspringt als das erste Ende der ersten Seitenwand (105) und das erste Ende der zweiten Seitenwand (106) und
    eine Seitenfalte in der ersten Seitenwand (105) vorgesehen ist, um einen ersten Rückbereich (108a) und einen ersten Vorderbereich bereitzustellen, wobei das erste Ende des ersten Rückbereichs (108a) weiter vorspringt als das erste Ende des ersten Vorderbereichs,
    wobei eine Seitenfalte in der zweiten Seitenwand (106) vorgesehen ist, um einen zweiten Rückbereich (108b) und einen zweiten Vorderbereich bereitzustellen, wobei das erste Ende des zweiten Rückbereichs (108b) weiter vorspringt als das erste Ende des zweiten Vorderbereichs und
    wobei das erste Ende des ersten Vorderbereichs und das erste Ende des zweiten Vorderbereichs weiter vorspringen als das erste Ende (102) der Vorderwand (101) und wobei das obere Ende des Beutels (1) umfasst:
    a) einen amorphen Alpha-Olefin-Klebstoffs, der auf die Innenfläche des ersten Endes (104, 107a, 107b) der Rückwand (103) aufgetragen ist, das weiter vorspringt als das erste Ende (102) der Vorderwand (101);
    b) den Klebstoff, der auf die Außenfläche des ersten Endes des ersten und des zweiten Rückbereichs (108a, 108b) aufgetragen ist, das jeweils weiter vorspringt als das erste Ende des ersten und des zweiten Vorderbereichs;
    c) den Klebstoff, der auf die Innenfläche des ersten Endes des ersten und des zweiten Vorderbereichs aufgetragen ist, das jeweils weiter vorspringt als das erste Ende (102) der Vorderwand (101);
    d) den Klebstoff, der auf die Außenfläche der Vorderwand (101) aufgetragen ist, die sich zwischen einer Klebstoffstopplinie (109) und dem ersten Ende (102) der Vorderwand (101) befindet, wobei die Klebstoffstopplinie (109) eine Faltlinie an der Außenfläche der Vorderwand (101) definiert und die Klebstoffstopplinie (109) proximal zu dem ersten Ende (102) der Vorderwand (101) liegt und wobei die Faltlinie etwa 0,64 cm (1/4 inch) unterhalb des ersten Endes der Vorderwand liegt; und
    wobei beim Verriegeln des Kunststoffbeutels (1) kein Klebstoff-zu-Klebstoff-Kontakt gebildet werden würde.
  9. Beutel nach Anspruch 8, wobei die erste Schicht Polypropylen, Polyethylen mit hoher Dichte, Polyethylen mit niedriger Dichte, Polyester oder Kombinationen davon umfasst.
  10. Beutel nach Anspruch 8, wobei zumindest Teile der Außenfläche der jeweiligen Vorderwand und Rückwand eine Mehrzahl von diskreten Bereichen aufweisen, die ferner mit einem Aufdruck versehen sind.
  11. Beutel nach Anspruch 8, wobei ein Teil der Vorderwand und ein Teil der Rückwand zu einem diskreten Bereich des Beutels kombiniert sind, der entweder an dem oder in der Nähe des ersten Endes oder an dem oder in der Nähe des zweiten Endes liegt, wobei der diskrete Bereich des Beutels einen Aufdruck umfasst.
EP13799463.8A 2012-11-20 2013-11-20 Verfahren zum abdichten eines kunststoffbeutels und nach diesem verfahren hergestellter kunststoffbeutel Active EP2925621B1 (de)

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US201261728334P 2012-11-20 2012-11-20
PCT/US2013/070965 WO2014081804A1 (en) 2012-11-20 2013-11-20 Method of sealing a plastic bag and plastic bag made by said method

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EP2925621A1 (de) 2015-10-07
WO2014081804A1 (en) 2014-05-30
US20170297801A1 (en) 2017-10-19
US9663284B2 (en) 2017-05-30
CA2892124C (en) 2019-09-17
US20140140642A1 (en) 2014-05-22
MX2015006383A (es) 2015-12-03
US10035637B2 (en) 2018-07-31
CA2892124A1 (en) 2014-05-30

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